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# s11 Bandwidth

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s11 s21 , formula for s11 , positive s11 , s11 s22
46 Threads found on edaboard.com: s11 Bandwidth

## How to make this UWB patch antenna better

How to make this UWB patch antenna better Hello Sir/Madam... Kindly see the attached picture. I have made a patch antenna. What I need I want to know how to make it better so that its radiation pattern will become uniform through out the bandwidth almost circular pattern. I want to also make its s11 Better so that its loss is minimum. How to

## Improve s11 of pifa antenna

Hello every Body, I'm a student and i work on PIFA antennas, i have designed a pifa antenna with coaxial Feeding but i have a problem i can't improve the value of s11, i have a good resonate frequency 2.4 GHz but s11 always > -10 db. Any one can help me here. It's urgent and thanks for advance. i can see you my antenna. 135481[/ATTA

## measuring bandwidth with s11 graph

hi friend can anyone help me find bandwidth from s11 graph in db? is the formula for measuring? i know the frequency the below -10 db line is bandwidth.

## Evaluate graph of bandwidth

Hi everyone, I am having trouble about evaluating graph of bandwidth, how to make Matlab understand how good a graph is? Example: Resonant frequency = 3.6 and s11 at there < -10 dB, bandwidth about 120 MHz Is there any idea to do this. Thank you!

## Genetic Algorithm for antenna

Hi everybody, I am having a project about "optimization for antenna using HFSS simulation through HFSS API". My trouble is now when i export data under Excel or Matlab table from HFSS result, i dont have any idea to analyze these file in Matlab, such as s11 plot, i dont have idea how to make matlab understand what value of bandwidth is? Could you

## Metamaterials: imaginary part of permittivity being negative

Hello dear friends, I'm working on a new metamaterial structure that have nonlinear properties with in a broad bandwidth. I have simulated the structure in cst and got the s11 and S21 of the structure. with the relations given in the articles calculated permittivity and permeability of the structure. but there is an amazing point in the result and

## Bandwidth Optimization in Agilent (Keysight) ADS

First you should define equations for each optimization target.For instance let your targets are ?s11?<-15dB, ?S22?<-10dB and ?S21?=15dB. You must define these equations in " Measurement Variable" block being as-for instance Input_return_Loss=dB(S(1,1)) Output_return_Loss=dB(S2,2)) Power_Gain=dB(S(2,1)) Then your have to place a "Goal" block for

## microstrip filter design

One solution is to run the feed line separately with a 50 ohm lumped port or wave port at each end of the line. Use parametric analysis by changing the length of the line, from the resultant s11/S21 you can estimate the good length of the feed line which gives s11 < -20 dB and S21 > -0.5 dB in the interested bandwidth ..... I believe that (...)

## Antenna Bandwidth Calculation

Hi, I would recommand you to estimate you bandwidth where the |s11| < -10dB . Also you might find this thread helpful :

## What are the basic parameters for analyzing a Frequency Selective Surface?

But the FSS elements resonance frequency, bandwidth will vary with the following. So you have to consider, -TE/TM polarization ( your s11,21 will be different for TE and TM) -Incidence angle variation (theta,phi) -parameters of the FSS elements(like width, length, periodicity,substrate thickness)

## Printed IFA for dual band GSM900 and PCN1800MHZ?

Hi guys, I was designing IFA for dual band operation using SIM900A, I have 100x15mm PCB space to lay the antenna. I got the s11 and VSWR very good in HFSS, but the bandwidth is small (it doesn't cover all the frequencies especially at the higher band (1710 - 1880MHZ) the s11 at these band edges is no more than -3dB. and the VSWR is more (...)

## bandwidth measurement

although S21 is the graph that will define bandwidth..... but if you want to extract bandwidth info from s11 than for general understanding u can say ... "the band on which the magnitude or s11 is below -10db or more (-20db, -30db etc) is your bandwidth... as because where S21 has its positive peak on the (...)

hi help thanks

## how to determines bandwidth of Microwave components

Hi, bandwidth in RF components is defined with respect to its s11 or returnloss.. Theoretically -10dB is taken for a mark but the lower or more negative the better. Industries take atleast 16 dB as reference and the band that falls below this in returnloss is taken to be bandwidth of the component..!! Regards

## Calculating Bandwidth of S11

Hello Anyone know about how to find the bandwidth of s11? Is there any formula? I have attached an example picture. thanks

## Antenna Bandwidth computing

Its also worth to check the gain in this frequency range to make sure that your antenna radiates. The s11 only shows a good match, but not what happens with the energy!

## UHF RFID TAG Antenna Broadband Design

See this Sonnet application note for a 900 MHz tag layout with extended bandwidth: What do you mean by "HFSS s11 formula is wrong" ?

## Gain and bandwidth calculation in HFSS...?

I have simulated a rectengular patch antenna(linefed) at the centre frequency of 2.4 GHz. The results (s11 and VSWR) are so confusing.. the whole plot of s11 is below -8dB and VSWR below 1.80.. Is it correct..? How can we calculate gain and bandwidth in that plot?? What is the formula to calculate bandwidth? Can anybody (...)

## how to simulate UWB pulses in HFSS?

Do I excite it with modulated Gaussian pulse? or would a lumped port just do? What's the difference between the two? I have a dipole antenna excited by a lumped port and displays s11 bandwidth (2-6 GHz)below -10dB. Is that considered a pulse? Please elaborate and excuse me if the question is so basic. Thanks.

## WAveguide to Coax in HFSS

Given that the transition is almost lossless, you can also optimize for s11.

## pyramidal horn with coaxial fed

Hello, To avoid confusion, can you post a link to your s11 result (smith chart with some frequency reference). To be honest I don't think you will get a reasonable match over 2..8 GHz with this feed scheme. It is likely that you will excite a wrong mode at the higher end of the frequency range (this will result in strong reduction in gain and d

## sp, s11 and BW of the input transistor in umc56

Hi, my circuit is the first stage (input) of a cascode LNA, I did the sp simulation and I reached to 87GHz of BW which is very uncommon, I mean the circuit i am simulating is from a journal that they reached to 13GHz and it can not be possible that i am doing it right. since umc65 doesn't have inductor I used from analogLib, ideal Lg and

## How to increase bandwidth of horn antenna

hi everyone!!! I've been designing horn antenna for Ku band with realized gain >15db But I can't rules out of learning the way to optimize bandwidth, s11 always about

## 0.8-2.2GHZ power splitter

hi i want to increase the s11 parameter of the power splitter to occupy a wide bandwidth,i have changed εr value too..can anyone suggest a way to increase that s11???

## Describing the stop bandwidth of a filter using S11 and S12 parameters

while considering the stop bandwidth of a filter one should describe in terms of s11 or S21.

## how to broaden peaks of s11 and s22 in lna design

hi, I am designing an LNA .While doing the impedence matching i get very narrow peaks of s11 and s22 a result of this s11 and s22 for the centre frequency comes below -10db but the whole bandwidth does not satisfy my requirement of s11 and s22 <-10db. Can somebody tell me how to slighly broaden the peaks of (...)

## Ceramic Material For Antenna

Hello I would like to know dimension, the s11 bandwidth and gain of UHF RFID antenna using cermaic. Could you please send me the data sheet of this antenna Best Regards

## 1-4GHz horn antenna design, lower frequencies s11 is bad

hi! i am designing a horn for 1-4 Ghz and i have been successful to some extent i-e for 2.5 to 4 performance is good but for lower frequencies s11 is not much low. can any one guide me on it how can i get lower s11 on lower frequencies????

## Need help what measurement needed after fabrication done.

Hai u should measure the "Return Loss-s11" value using Network Analyzer and it should be -10dB min ( or above than that) in ur operating frequency and check bandwidth. If it is working fine then u go for radiation pattern measurement in a anechoic chamber.

## What is the purpose of taking -10dB bandwidth ?

For antenna antennas, you will have s11 and it is the return loss. We want to reduce it in order to improve the efficiency. The question is how big |s11| is acceptable. For this reason, we define the critiera as |s11|<-10 dB. When |s11| = -10 dB, it corresponds to about 10% of the incident power gets reflected. It is the (...)

## optimize multiband antenna (filter)

You can define a goal as mag(s11)< - 10.5 dB over a bandwidth you are interested. You can define multiple such goals with each one in each band. Certainly, you will need to make sure your tuning mechanism should be able to achieve it.

## How to find the Q factor for a resonant antenna?

Hi, I want to reformulate my previous post by simple question: how to find the Q factor for a resonant antenna or a resonant Transmission Line using S parameters from ADS or HFSS simulation. I know that Q is equal to fcenter/bandwith. How to calculate the bandwith, can i find this bandwidth from -10dB or VSWR(s11),VSWR(S21). I find this in

## How to enhance the bandwidth of PIFA

Hi, I have simulated a single band PIFA for GSM 900 applications. The center frequency is well coinciding with 925 MHz but the bandwidth is to small. |s11| is around -20 dB. How can I widen the bandwidth? I'm using Agilent ADS2005A momentum. Your guidance is appreciated in this regard...

## antena percentage bandwidth and VSWR?

There is no specific relationship. VSWR bandwidth (and there are many other definitions) and s11 are very depandant on the type of antenna in question (your question does not provide an antenna type). bandwidth can be a few percent and it can be many octives.

## Help me with impedance matching of Chevbyshev matching network

Hi Guys, Im need some help on Chevbyshev matching network. I would like to know on hw can the atached circuit`s s11and return loss parameter can be simulated ? or any notes or software i can use to simlate the s11 for the circuit? I would need some help on : 1. Compute the operating frequency, reflected bandwidth, and reduce (...)

## [updated!]U-slot on patch antenna for bandwidth enhancement

Once i tried to etch a U-slot on a well matched bottom-fed antenna, the s11 result turned to be extremely bad. are there any guidelines for U-slot (or other shape of the slot) technique, which is used to enlarge the bandwidth of the patch antenna? Most paper i found just give the final parameters but would not tell the design steps: e.g how the

## How to optimize 3dB bandwidth in HFSS??

This has been puzzled me for a while. There's no such thing like a "3dB BW" in HFSS. I understand you may watch the s11 curve and measure the portion higher than -10 dB for the bandwidth. But how can you optimize it? Is there a way to write an express in "output variable" to calculate the 3dB BW automatically? Thanks Add

## How to find the Q factor from antenna and how to calculate bandwidth from CST?

hi. I want to design antenna as resonator . But how to find the Q factor from antenna. ( using CST or HFSS). Q is equal to fcenter/bandwith. How to calculate bandwith from CST ( can I use the S parameter , and calculate the bandwith from -10dB -or VSWR 2:1) Thank you for your help From s11 measure - you matching Fc to best po

## How to measure antenna bandwidth?

Hi, How do I measure the -3dB bandwidth of an antenna in HFSS? Is it by plotting the s11 and obtain the bandwidth from there? If yes, do I measure the bandwidth with reference to the -3dB point on the s11 curve? Or is it some other reference point? Also, in real-life measurements, how can I measure my (...)

## Two questions to be settled, thank you!

1) Second option: Simulate and plot s11 and determine manually the impedance bandwidth. ***In hfss 9.2, can we derive the 10 dB impedance bandwidth of an antenna directly as it is a intrinsic parameter or should we first determine the frequency points where the s11 value is -10dB manually, then compute out the 10 dB (...)

## two questions in simulation

1 In hfss 9.2, can we derive the 10 dB impedance bandwidth of an antenna directly as it is a intrinsic parameter or should we first determine the frequency points where the s11 value is -10dB manually, then compute out the 10 dB impedance bandwidth ? Thank you! 2 When i solve a problem using CST MWS 5.0 (adopt transient solver), it (...)

## HFSS 9.2 - Ploting Gain vs Frequency of simulated antenna

Hi, i am having problem ploting the gain vs frequency plot using HFSS. My s11 is having a reading of better than 10dB with a bandwidth from 25Ghz to 35Ghz, and the return loss at 20Ghz is ard 2dB, meaning most of the signal is being reflected. But when i plot the gain vs frequency plot, the gain at 20Ghz is much higher compared to the gain at 3

## Microstrip fix antenna feed

i am simulating a Sierpinski patch antenna side fed by microstrip line, but the input impedance is so high that the s11 is bad, how to choose the width of microstrip line to achieve a good match? thanks

## the bandwidth defined in handset

Dear fishliker, becouse of tight space limits in todays mobile handsets, often active antnnas is using in them. more printed small dipoles, or ok, PIFA, but all ofem with very low gain (becouse of bad matching). so, if you really want to have the definition, you should looking for gain conditions in the operating band. +the europian standard fo

## how much miniaturization yet achieved for MPAs?

Hi all, Does anyone know how much miniaturizatiuon is yet achieved for microstrip pa t ch antennas maintaining a reasonable bandwidth (say, 10%s11<-10)? I am working on a paper and It will help me alot. regards, murti